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Home >> BMW >> 2021 >> 430i xDrive >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Water Pump -- Repair (G22, G23 & G26) >> 11 51 Water Pump >> 11 51 580 replacing the relay valve for the high-temperature coolant circuit (RWD with 4-cyl. engine) (430i coupe and convertible) >> Removing the relay valve for the high-temperature coolant circuit

Removing the relay valve for the high-temperature coolant circuit

WARNING: Working on 12 V electrical system. 
Risk of short circuits! Risk of fire! 
  • Make sure that there is no charger  connected to the jump start terminal in the engine compartment.
  • Detach battery ground lead from battery.
  • For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.
NOTE: RISK OF DAMAGE 
Damage to battery terminal, the safety battery terminal or the intelligent battery sensor (IBS). 
Damaged battery terminals can lead to malfunctions or vehicle electrical system faults. 
  • Detach battery terminal from battery pole by carefully shifting to and fro. Do not pry off using a tool.

Preliminary work 

NOTE: RISK OF DAMAGE 
Electrostatic discharge. 
Damage to or destruction of electrical components. 
  • Leave the electrical components in their original packaging until they are being installed. Only use the original packaging for returning the product. Always package removed components straight away.
  • Read and comply with user information on using the associated special tool 12 7 060.
  • Only tap the housings of electrical components. Do not tap pins or multi-pin connectors directly.
  • Wear electrically conductive clothing and antistatic shoes (with ESD symbol).
  • For additional information see: NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE) .
NOTE: TECHNICAL INFORMATION 
Collect and dispose of emerging fluids. Observe country-specific waste disposal regulations.